Bhaswati Bhattacharyya

GHRSS Survey:

GMRT High Resolution Southern Sky (GHRSS) survey for pulsars and transients with the GMRT scans the southern sky, with comarable of higher sensitivities than any other existing or ongoing low-frequency surveys. This survey is conducted in two phases, phase-1 at 322 MHz with the 32 MHz legacy GMRT system (discovered 13 pulsars) and phase-2 at 400 MHz with 200 MHz uGMRT system(14 discoveries and counting). When complete, the survey will cover the entire sky southern sky up to declenation of -20°. GHRSS discoveries include the first MSP and first RRATs discovered by the GMRT. Data taking began in 2014 and is phase-2 expected to be completed in 2022. Survey analysis is done in Hydrus cluster in University of Manchester (for phase-1 of the survey) and NCRA HPC (for phase-1 and phase-2) with PRESTO based search pipeline. To date there are 31 GHRSS discoveries among which there are 2 MSPs, 2 mildly recycled pulsars and 3 RRATs.

GHRSS Team:

B. Bhattacharyya(NCRA), J. Roy(NCRA), B. W. Stappers(University of Manchester), M. Keith(University of Manchester), M. Malenta(University of Manchester), M. A. McLaughlin(Univ. of West Virginia), P. S. Ray(Naval Research Laboratory), S. M. Ransom(National Radio Astronomy Observatory), J. N. Chengalur(NCRA), A. G. Lyne(University of Manchester), S. Kudale(NCRA), U. Panda(NCRA), S. Singh(NCRA), W. Armour(University of Oxford), K. Adamek(Silesian University), S. Sunder(NCRA), S. Kumari(NCRA)

GHRSS Publications:

The GMRT High Resolution Southern Sky Survey for pulsars and transients -I. Survey description and initial discoveries

Bhattacharyya, B., Cooper, S., Malenta, M., Roy, J., Chengalur, J. N., Keith, M, Kudale, S.,McLaughlin, M., Ransom, S. M., Ray, P.S., Stappers B. W. et al., 2016, Astrophysical Journal, 817, 130

Search for pulsars and transients with the GMRT

Bhattacharyya B., published in the proceedings of IAU Symposium 337 - Pulsar Astrophysics: The Next Fifty Years

Time-domain Astronomy with the GMRT: uGMRT to eGMRT

Roy J., published in the proceedings of IAU Symposium 337 - Pulsar Astrophysics: The Next Fifty Years

Post-correlation beamformer for time-domain studies of pulsars and transients

Roy J., Chengalur J. N., Pen U. L., 2018, ApJ, 864, 160

The GMRT High Resolution Southern Sky Survey for pulsars and transients -II. New discoveries, timing and polarization properties

B. Bhattacharyya, J. Roy, B. W. Stappers, T. Johnson, C. D. Ilie, A. Lyne, M. Malenta, P. Weltevrede, J. Chengalur, S. Cooper, B. Kaur, M. Keith, M. Kerr, S. Kudale, M. A. McLaughlin, S. M. Ransom, P. S. Ray, 2019, ApJ, 811, 1

GHRSS Discoveries:

Table listing GHRSS discoveries

Name	Type	Period (ms)	DM (pc/cc)	Flux density(mJy)
J0252-53	MSP	11.19	18
J0418-4154	PSR	757.11	24.5	10.3
J0514-4407	PSR	320.7	15.4	9.7
J0600-46	PSR	798.8	50.36	10
J0702-4956	PSR	666.66	98.7	15.7
J0919-42	PSR	812.6	57	6.4
J0941-43	PSR	447.7	105.5	2.3
J1023-43	PSR	454.3	62.7	1.6
J1239-48	PSR	653.89	107.6	0.4
J1242-46	PSR	1411.3	76.5	12
J1243-47	MSP	5.31	78.6	0.9
J1245-52	PSR	835.39	86.3	1
J1255-46	mildly recycled	52.0	42.9	0.8
J1406-50	RRAT	-	40	-
J1428-42	PSR	234.7	66.0	1.8
J1447-50	PSR	960.2	107.8	0.7
J1456-48	PSR	536.81	133.0	1.2
J1516-43	mildly recycled	36.02	70.25	0.7
J1517-31	PSR	1103.7	61.7	0.32
J1517-31	PSR	140.67	51.0	0.7
J1559-44	PSR	1169.89	122.0	1.7
J1708-52	PSR	449.62	102.6	1.4
J1726-52	PSR	631.84	119.7	0.7
J1810-42	PSR	532.20	104.9	1.5
J1845-40	PSR	324.18	68.4	-
J1845-40	RRAT	373.48	47.8	-
J1850-48	RRAT	-	23	-
J1936-30	PSR	1.6758	42.3	0.8
J1947-43	PSR	180.94	29.9	4.7
J2004-38	RRAT	-	23	-
J2059-48	MSP	9.48	25.04	-
J2144-5237	MSP	5.04	19.0	1.6